The VHF Doppler radar at Shigaraki, Japan, is shown to be capable of investigating mesoscale meteorological phenomena in the troposphere. Three dimensional velocities of air and precipitation particles in a cold frontal system are measured directly. The time and altitude resolution obtained with this system are unequalled by other conventional instruments. A strong and deep updraft associated with the frontal passage is observed extending above 10 km. Enhanced echoes accompanying the updraft are also detected with a meteorological radar.